package com.sky.aspect;


import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.entity.Employee;
import com.sky.enumeration.OperationType;
import lombok.SneakyThrows;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;


/*
* 自定义切面，实现公共字段填充的处理逻辑
* */
@Slf4j
@Component
@Aspect
public class AutoFillAspect {

    /*
    * 切入点
    * */
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut(){}

    /*
    * 通知
    * */
    @SneakyThrows
    @Before("autoFillPointCut()")
    public void AutoFill(JoinPoint joinPoint){
        log.info("公共字段自动填充...");

        //获取到当前被拦截的方法上数据库操作类型
        MethodSignature signature = (MethodSignature) joinPoint.getSignature(); //获取方法签名
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class); //获取方法上的注解对象
        OperationType operationType = autoFill.value(); //获取数据库操作类型

        //获取方法的参数，即与数据库对接的实体类对象
        Object[] args = joinPoint.getArgs();
        if (args == null || args.length == 0)
            return;
        Object enity = args[0]; //获取实体对象

        //准备赋值的数据
        LocalDateTime now = LocalDateTime.now(); //当前时间
        Long empId = BaseContext.getCurrentId(); //当前登录者id

        //设置参数的公共字段属性，依据方法类型不同进行赋值
        if (operationType == OperationType.INSERT){ //新增操作
            try {
                //获取设置属性的方法
                Method setCreateTime = enity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setCreateUser = enity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                Method setUpdateTime = enity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = enity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                //运行方法，为实体的属性赋值
                setCreateTime.invoke(enity, now);
                setCreateUser.invoke(enity, empId);
                setUpdateTime.invoke(enity, now);
                setUpdateUser.invoke(enity, empId);
            }catch (Exception e){
                e.printStackTrace();
            }
        }
        else if (operationType == OperationType.UPDATE) { //更新操作
            try{
                Method setUpdateTime = enity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = enity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                setUpdateTime.invoke(enity, now);
                setUpdateUser.invoke(enity, empId);
            }catch (Exception e){
                e.printStackTrace();
            }
        }
    }
}
